#include<stdio.h>
int Sum(int s,int e)
{
  int result = 0;
  int i;
  for( i = s;i <= e;i++)
  {
    result += i;
  }
  return result;
}
int main()
{
  int start =1;
  int end =100;
  printf("I will begin\n");
  int n = Sum(start,end);
  printf("running done,result is:[%d-%d]=%d\n",start,end,n);
  return 0;
}
